‘Object reference not set to an instance’

‘Object reference not set to an instance’

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When adding the barcode control to a form, the following errors may occur:

  • Object reference not set to an instance of an object.
  • The .NET assembly ‘????.dll’ could not be found.
  • Cannot Add Barcode Control to Toolbox or Form in Visual Studio .NET

Solution(s):

If the barcode control cannot be added to the project, make sure the proper control is used for the type of application. There are 2 types of applications in Visual Studio .NET; Web (Web Forms) and local (Windows Forms).

If the proper control is used in the appropriate application and it is still not functioning, Delete all files from %temp%, remove the control from the project and computer and download and reinstalling the control again.